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EC number: 224-924-0 | CAS number: 4553-89-3
Endpoint summary
Administrative data
Description of key information
Adsorption/desorption:
The
partition coefficient of test substance disodium
4,4'-[[2,4-dihydroxy-5-(hydroxymethyl)-1,3-phenylene]bis(azo)]bisnaphthalene-1-sulphonate
(CAS No.4553-89-3) was determined as per the HPLC method (OECD
Guideline-12). The Log Koc value was found to be 3.259± 0.004 at 25°C.
Henry’s law constant:
The Henry's Law constant of
the substance Disodium
4,4'-[[2,4-dihydroxy-5-(hydroxymethyl)-1,3-phenylene]bis(azo)]bisnaphthalene-1-sulphonate
is estimated to be 7.37E-38 atm m³/mol which is <0.000000001 atm m³/mol.
Additional information
Adsorption/desorption:
Data available for target
Disodium
4,4'-[[2,4-dihydroxy-5-(hydroxymethyl)-1,3-phenylene]bis(azo)]bisnaphthalene-1-sulphonate
for the endpoint Adsorption are summarized as follows:
In key study, The partition Coefficient n-octanol/water of disodium 4,4'-[[2,4-dihydroxy-5-(hydroxymethyl)-1,3-phenylene]bis(azo)]bisnaphthalene-1-sulphonate (CAS No. 4553-89-3) was determined by the Reverse Phase High Performance Liquid Chromatographic method according to OECD Guideline No. 121 for testing of Chemicals. The reference substances were chosen according to estimated Kocrange of the test substance and generalized calibration graph was prepared. The reference substances were 4 chloroaniline, 4 methylaniline, N methylaniline, 2 Nitrophenol, Nitrobenzene, 4-Nitrobenzamide , N,N-dimethylbenzamide , N-methylbenzamide , Benzamide , phenanthrene having Kocvalue ranging from 1.239 to 4.09. The Log Koc value was determined to be 3.259± 0.004 at 25°C. This value indicates the chemical has Strong sorption to soil and sediment and negligible to slow migration potential to ground water.
Further supporting the above data, Soil Adsorption Coefficient i.e Log Koc value of Disodium 4,4’-(2,4-dihydroxy-5- hydroxymethyl-1,3-phenylene bis-azo) di- (naphthalene-1-sulfonate) was estimated as 6.4217 (i.e. Koc:2640000 L/kg) by means of MCI method. This indicates that Disodium 4,4’-(2,4-dihydroxy-5- hydroxymethyl-1,3-phenylene bis-azo) di- (naphthalene-1-sulfonate) has very strong sorption to soil and sediment and negligible migration potential to groundwater.
Based on the above data, it is concluded that Disodium 4,4’-(2,4-dihydroxy-5- hydroxymethyl-1,3-phenylene bis-azo) di- (naphthalene-1-sulfonate) has Strong sorption to soil and sediment and negligible to slow migration potential to ground water.
Henry’s law constant:
The Henry's Law constant of the substance Disodium 4,4'-[[2,4-dihydroxy-5-(hydroxymethyl)-1,3-phenylene]bis(azo)]bisnaphthalene-1-sulphonate is estimated to be 7.37E-38 atm m³/mol which is <0.000000001 atm m³/mol.
However due to restriction in above key value field, the value considered for CSR is 0.000000001 Pa m³/mol. This value indicates that the chemical has extremely low vapour pressure.
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